Ok here's the deal,
If the vehicle with a driver fell off the map, the vehicle can sometimes respawn near you.
If you saw that vehicle, and you enter the vehicle, the vehicle suddenly spawns again where it fell of the map before and respawns without a single script triggering.

Steps To Reproduce

Enter a vehicle, teleport yourself under the road and you'll fall down. And as usual, you'll respawn on top of the nearest object. But, If you saw the same vehicle (that fell off the map), try entering the vehicle. That's when the problem starts.